I do have a feeling that if it is indeed a children's bedroom for a kid that has been removed from her, that it might be someone we already know. Don't know if it's Sage, Tybalt or someone else, but that might be a kind of logical conclusion storywise to that scenario. If it's someone we don't know, it's just "wow, you've had a kid in the past that was taken, that sucks" (to be blunt). However if it is someone we know, it can bring not only a little bit of character development from Bella, but also the person of who she is the mother of.